Tuyere for blast furnaces



y 1930- E. H. HOLZWORTH 1,759,114

- TUYERE FOR BLAST FURNACES Filed May 17, 1927' Patented May 20, 1930 UNITD STATE ERNEST H. HOLZWORTH, OIE BUFFALO, NEW YORK TUYERE FOB. BLAST FURNACES Application filed May 1?, 1927. Serial No. 191,950.

This invention relates to improvements in the tuyeres used in connection with blast furnaces.

One of its objects is the provision of a tuyere having novel means for the clrculation of a cooling fluid around the nose end of the tuyere to enable the same to withstand the high temperatures present in blast furnaces.

Another object of the invention is to provide a water cooled tuyere which is so constructed as to provide a maximum cooling effect at the nose end of the tuyere and thus prolong its life.

A still further object is to provide a tuyere of this character which is simple and inexpensive in construction, which is eflicient in operation and which will materially reduce the maintenance costs of blast furnaces.

In the accompanying drawings: Figure 1 is a top plan view of a tuyere embodying my invention. Figure 2 is a vertical longitudinal section taken on line 2&2, Figure 1. Figure 3 is a transverse section on line 33, Figure 2. Figure 4 is a detached perspective view of the circulating coil or conduit.

Similar characters of reference indicate corresponding parts throughout the several views.

The improved tuyere consists of a substantially frusto-conical body 10 made of a copper alloy or other appropriate material and having the usual passage 11 for the admission of air to the furnace, this passage being connected at its base or outer end with the source of air supply by a pipe 12. The tuyre-body has a cooling chamber or compartment 13 surrounding its air passage which extends from the base of said body to a point short of its inner or nose end, as shown in Figure 2. Disposed in the nose end of the tuyere is a second cooling compartment which preferably consists of a coil 14 of steel pipe or the like encased or embedded within the tuyere-body and'having an inlet branch or conduit 15 extending lengthwise thru the compartment 13 and connected to a water supply pipe 16. This coil also has an outlet branch 17 connected therewith 5. which may be parallel with the companion inlet branch '15, as shown in Figures 1 and 4, and which preferably discharges into the inner end of the compartment 13. The nose end of the tuyere-body is thickened, as shown, and the coil is cast therein, so that it is isolated and separate fromthe main circulatmg compartment. Connected to the outer end of the tuyere-body is a'discharge pipe 18 thru which the water or other cooling fluid is passed after being circulated first thru the coil 14 and then thru the compartment 13.

By this construction the cold water is delivered directly to the coil 14 encased in the nose end of the tuyere where the maximum cooling is required. While this coil is preferably made of a steel pipe it is to be understood that the same may be made of any other suitable material which has a higher melting point than that of the tuyere-body. The location of coil in the nose end of the tuyere and its isolation from the compartment 13 keeps the temperature at the nose to a minimum and materially reduces the possibility of its burning ofi'. Furthermore, the provision of coil arranged as shown insures a constant circulation of the water under pressure in a defined course of travel, the coldest part of the water being delivered to the hottest part of the tuyere with the result that all portions of the nose are kept at a substantially even temperature and danger of cracking or breaking of the tuyere due to uneven expansion and contraction is thereby eliminated.

It will be noted that the cross-sectional area of the coil 14, together with its branches 15 and 17, is approximately the same as that of the water supply pipe 16, so that the water is caused to circulate at a uniform velocity thru the coil.

I claim as my invention A blast furnace tuyere, comprising a body having an air passage extending therethrough and a water-circulating compartment surrounding said air passage and extending from the base to a point short of the nose of said body, and a circulating coil embedded in the nose and isolated from said compartment, said coil having an inlet branch extending lengthwise through the water-circulating compartment for delivering a continuous supply of water through the coil and an outlet branch disposed substantially parallel with said inlet branch and discharging into the inner end of said com partment, the coil being made of a material having a higher melting point than that of the tuyere-body.

ERNEST H. HOLZWORTH. 

